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Thanks Red Badger. That Ancient Origins website though, still kind of a pile of coprolite.

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The Younger Dryas impact hypothesis: review of the impact evidence | Martin Sweatman | School of Engineering | Earth-Science Reviews | 19 May 2021
Abstract | Firestone et al., 2007, PNAS 104(41): 16016-16021, proposed that a major cosmic impact, circa 10,835 cal. BCE, triggered the Younger Dryas (YD) climate shift along with changes in human cultures and megafaunal extinctions. Fourteen years after this initial work the overwhelming consensus of research undertaken by many independent groups, reviewed here, suggests their claims of a major cosmic impact at this time should be accepted. Evidence is mainly in the form of geochemical signals at what is known as the YD boundary found across at least four continents, especially North America and Greenland, such as excess platinum, quench-melted materials, and nanodiamonds. Their other claims are not yet confirmed, but the scale of the event, including extensive wildfires, and its very close timing with the onset of dramatic YD cooling suggest they are plausible and should be researched further. Notably, arguments by a small cohort of researchers against their claims of a major impact are, in general, poorly constructed, and under close scrutiny most of their evidence can actually be interpreted as supporting the impact hypothesis.

Time for THE BOOK. The first part of the article says there are no craters. Obviously they have never seen the picture of the bottom of Lake Michigan with either 2 or 3 craters. Two at either end of the lake and a small one between them. Also, in a quick read I did not see anything about the Carolina Bays which may have been caused when gigantic ice chunks were thrown off as Lake Michigan bolides hit. The fact that the trajectory lines converge to one side of Lake Michigan can be explained by the amount the earth rotated while the chunks were in the air while traveling to their landing sites. Why do these scientists have to keep reinventing the wheel when Firestone and his crowd did such a good job. They should be building on this work, not theorizing from scratch. As to missing mega-fauna. The Clovis people pretty much disappeared. Probably all big animals were not killed off then, but on the other hand were so reduced in abundance that as the human population reinvigorated, they were finally killed off.